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An empty pool being filled with water at a constant rate

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Manager
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An empty pool being filled with water at a constant rate [#permalink] New post 20 Dec 2012, 04:53
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  15% (low)

Question Stats:

79% (02:17) correct 20% (01:22) wrong based on 144 sessions
An empty pool being filled with water at a constant rate takes 8 hours to fill to 3/5 of its capacity. How much more time will it take to finish filling the pool?

(A) 5 hr 30 min
(B) 5 hr 20 min
(C) 4 hr 48 min
(D) 3 hr 12 min
(E) 2 hr 40 min
[Reveal] Spoiler: OA
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Re: An empty pool being filled with water at a constant rate [#permalink] New post 20 Dec 2012, 04:56
Expert's post
Walkabout wrote:
An empty pool being filled with water at a constant rate takes 8 hours to fill to 3/5 of its capacity. How much more time will it take to finish filling the pool?

(A) 5 hr 30 min
(B) 5 hr 20 min
(C) 4 hr 48 min
(D) 3 hr 12 min
(E) 2 hr 40 min


As pool is filled to 3/5 of its capacity then 2/5 of its capacity is left to fill.

Since it takes 8 hours to fill 3/5 of the pool, then to fill 2/5 of the pool it will take 8/(3/5)*2/5 = 16/3 hours = 5 hours 20 minutes (because if t is the time needed to fill the pool then t*3/5=8 --> t=8*5/3 hours --> to fill 2/5 of the pool 8*5/3*2/5=16/3 hours will be needed).

Or plug values: take the capacity of the pool to be 5 liters --> 3/5 of the pool or 3 liters is filled in 8 hours, which gives the rate of 3/8 liters per hour --> remaining 2 liters will require: time = job/rate = 2/(3/8) = 16/3 hours = 5 hours 20 minutes.

Answer: B.
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Manager
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Joined: 08 Dec 2012
Posts: 64
Location: United Kingdom
GMAT 1: 710 Q0 V0
WE: Engineering (Consulting)
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Re: An empty pool being filled with water at a constant rate [#permalink] New post 26 Jan 2013, 04:33
I tried using just ratios to solve this (because rate is constant):

8Hrs to fill 3/5 tank i.e 0.6 of the tank
X hrs to fill 2/5 tank i.e 0.4 of the tank

=> 8/0.6 = X/0.4
=> X=3.2/0.6 = 32/6 = 16/3 = 5.33hrs i.e 5hr20min
Manager
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Joined: 28 Aug 2012
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Concentration: Operations, Marketing
GMAT 1: 510 Q36 V25
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WE: Information Technology (Other)
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Re: An empty pool being filled with water at a constant rate [#permalink] New post 28 Jan 2013, 13:28
Hey,
Is'nt 16/3 = 5.3 ~ . This might be silly, but i chose 5 hours 30 mins . I don't want to make this mistake again, kindly help me :shock:

Thanks
Aj
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Re: An empty pool being filled with water at a constant rate [#permalink] New post 28 Jan 2013, 14:11
30 minutes/60 minutes=.5, so 5 and a half hours would be 5.5, not 5.33.
Re: An empty pool being filled with water at a constant rate   [#permalink] 28 Jan 2013, 14:11
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